Graph layouts

layout = {Automatic, "CircularEmbedding", "HighDimensionalEmbedding", "LayeredDrawing", "RadialEmbedding", "SpiralEmbedding", "SpringElectricalEmbedding", "SpringEmbedding"};
Grid[Flatten[{Style[#, 11, FontFamily -> "Arial"]& /@ #, Table[PetersenGraph[6, 3, GraphLayout -> l, ImageSize -> {125, 125}], {l, #}]}& /@ Partition[layout, 4, 4, 1], 1], Frame -> {All, {True, False, True, False}}, FrameStyle -> LightGray, Spacings -> {1, {{2, 1}}}]

Grid[{{Automatic, CircularEmbedding, HighDimensionalEmbedding, LayeredDrawing}, {Graph[<12>, <15>], Graph[<12>, <15>], Graph[<12>, <15>], Graph[<12>, <15>]}, {RadialEmbedding, SpiralEmbedding, SpringElectricalEmbedding, SpringEmbedding}, {Graph[<12>, <15>], Graph[<12>, <15>], Graph[<12>, <15>], Graph[<12>, <15>]}}, Frame -> {All, {True, False, True, False}}, FrameStyle -> GrayLevel[0.85], Spacings -> {1, {{2, 1}}}]