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