One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,7)(6,8)(9,10)(11,15)(12,14)(13,16)(17,18,21,25)(19,27,29,23)(20,31,33,42)(22,36,35,26)(24,37,41,34)(28,44,32,48)(30,39,46,43)(38,45,40,47)(1,3,5,2)(4,7,8,6)(9,11,12,16)(10,13,14,15)(17,19)(18,23)(20,32)(21,29)(22,30)(24,40)(25,27)(26,39)(28,33)(31,44)(34,47)(35,46)(36,43)(37,45)(38,41)(42,48)(11,16)(13,15)(17,20,21,33)(18,24,25,41)(19,28,29,32)(22,37,35,34)(23,38,27,40)(26,42,36,31)(30,47,46,45)(39,44,43,48)(2,3)(6,7)(10,14)(13,15)(17,19)(18,23)(20,28)(21,29)(22,30)(24,38)(25,27)(26,39)(31,48)(32,33)(34,45)(35,46)(36,43)(37,47)(40,41)(42,44) involution — undirected(1,4,5,8)(2,6,3,7)(19,29)(23,27)(28,32)(30,46)(38,40)(39,43)(44,48)(45,47)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.