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