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