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