One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,12)(10,15)(11,13)(14,16)(17,18,22,26)(19,27,30,31)(20,25,21,24)(23,28,32,29)(35,41)(36,43)(38,45)(40,47)(42,44)(46,48)(2,6)(4,12)(7,13)(8,9)(11,16)(14,15)(17,19)(18,23)(20,28)(21,29)(22,30)(24,31)(25,27)(26,32)(33,34)(35,38)(36,40)(37,39)(41,45)(42,46)(43,47)(44,48) involution — undirected(1,3)(2,7)(4,11)(5,10)(6,13)(8,15)(9,14)(12,16)(18,24)(20,21)(23,31)(25,26)(27,32)(28,29)(33,35,37,42)(34,38,39,46)(36,44,43,41)(40,48,47,45)(2,8)(3,10)(6,9)(11,16)(17,20,22,21)(18,25,26,24)(19,28,30,29)(23,27,32,31)(34,39)(38,46)(40,47)(45,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.