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