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