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I have a graph g. I want a set of graphs c which holds the community subgraphs of g.

I tried c = Subgraph[g, FindGraphCommunities[g]], but it only outputs the whole graph g. I see in the documentation that FindGraphCommunities returns a list of vertices, this may be why. How do I also get the edges?

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If I understand your query:

g = Graph[{1 \[UndirectedEdge] 2, 2 \[UndirectedEdge] 3, 
   1 \[UndirectedEdge] 3, 3 \[UndirectedEdge] 4, 
   4 \[UndirectedEdge] 5, 7 \[UndirectedEdge] 6, 
   8 \[UndirectedEdge] 6, 5 \[UndirectedEdge] 7, 
   7 \[UndirectedEdge] 8}];

coms = FindGraphCommunities[g];

Row[Subgraph[g, #, VertexLabels -> "Name"] & /@ coms]

enter image description here

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2  
FYI you can use the notation 1 <-> 2 for undirected edge. – Simon Woods May 21 '14 at 9:32
    
@SimonWoods: Yeah, should have done that before pasting code... – ciao May 21 '14 at 9:34

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