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