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