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