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)(11,16)(12,14)(13,15)(17,18)(19,27)(20,31)(21,25)(22,35)(23,29)(24,33)(26,34)(28,41)(30,37)(32,46)(36,48)(38,47)(39,43)(40,44)(42,45) involution — undirected(1,3,5,2)(4,7,8,6)(11,12)(14,16)(17,19,21,29)(18,23,25,27)(20,28,32,42)(22,30,34,44)(24,36,38,39)(26,37,35,40)(31,45,46,41)(33,43,47,48)(2,3)(6,7)(9,11,13,12)(10,14,15,16)(17,20,22,33,21,32,34,47)(18,24,26,31,25,38,35,46)(19,28,30,43,29,42,44,48)(23,36,37,45,27,39,40,41)(1,4,5,8)(2,6,3,7)(18,25)(19,29)(24,38)(26,35)(28,42)(30,44)(31,46)(43,48)(9,12,13,11)(10,14,15,16)(19,29)(23,27)(28,42)(30,44)(36,39)(37,40)(41,45)(43,48)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.