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