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The vertex_size parameter should work (it works fine for me in Sage 4.6.2):
G = digraphs.RandomDirectedGN(5)
G.plot(vertex_size=200, layout='circular')
According to the documentation for plot, however, edge_size is not a valid parameter. You can try looking through the documentation of NetworkX for parameters to control the edge style (arrows and such) and pass these to Sage's graph plot function via the edge_style parameter.
