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