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