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