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