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