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