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