The political instability comes as the country of fewer than 1 million people faces the prospect that oil revenues in the next decade could make it one of the wealthiest in the hemisphere.
"The delegation will meet with the leadership of all parties that contested the poll,” the Community said in a statement.
The regional bloc said its delegation includes current chair and Barbados Prime Minister Mia Mottley, Keith Rowley of Trinidad and Tobago, Keith Mitchell of Grenada, Roosevelt Skerrit of Dominica and Ralph Gonsalves of St. Vincent and the Grenadines.
The governing coalition led by retired army Gen. David Granger said it won the elections by two seats in the 65-seat parliament, while the main opposition People’s Progressive Party, or PPP, said it won by three seats.
The factions are mainly divided along ethnic lines, with Granger's coalition supported by the Afro-Guyanese population and the PPP opposition backed by the Indo-Guyanese community. There is also a smaller number of indigenous Guyanese.
A court was expected to rule this week on the election, whose results have yet to be formally announced.
The dispute had led to street protests, mostly by opposition supporters, in the past week. Police shot and killed a coastal village teenager who they said had attacked officers with a machete. Several others were injured by shotgun pellets. Other protesters burned tires, blocked highways and threw stones at school buses, injuring several students.
Both sides have appealed for calm. The protests have faded for now.
The United States and other Western nations have warned against the swearing-in of any president pending court challenges and verification of ballots. Counting and verification of ballots have been stopped since March 5.
U.S. and other observers saw “flawed tabulation” in the election and "any government sworn in on the basis of that result would not be legitimate,” according to Michael Kozak, the U.S. State Department's acting assistant secretary of state for Western hemisphere affairs.
This year's elections have been widely viewed as the most crucial since independence from Britain in 1966, largely because the country is one of the world’s newest producers of oil and could earn billions in revenues.
Guyana recently sold its first million barrels to markets in the Far East and southern U.S. states. It will get four more similar sized shipments this year worth about $300 million as part of production-sharing arrangements with a consortium led by ExxonMobil, along with Hess Oil of the US and Nexen of China.