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Try this:

sage: g1 = Graph({0:{1:'a'}, 1:{2:'b'}, 2:{0:'c'}})
sage: g2 = Graph({0:{1:'a'}, 1:{2:'b'}, 2:{3:'c'}, 3:{0:'d'}})
sage: G = graphics_array([g1.plot(), g2.plot()])
sage: G.show(axes_pad=0.1)