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