shapes={"Capsule","Circle","ConcaveHexagon","Diamond","FiveDown","Parallelogram","RoundedUpTrapezoid","Square","Star"};

graphs=Graph[{1\[UndirectedEdge]2,1\[UndirectedEdge]6,2\[UndirectedEdge]4,2\[UndirectedEdge]3,4\[UndirectedEdge]5,5\[UndirectedEdge]1,6\[UndirectedEdge]2},VertexShapeFunction->#,VertexSize->0.2,PlotLabel->Style[#,11,FontFamily->"Verdana"],VertexStyle->Directive[EdgeForm[None],Hue[.6,.5,.8]],EdgeStyle->Gray,ImageSize->{180,150}]&/@shapes;

Grid[Partition[graphs,{3}],Frame->All,FrameStyle->LightGray]