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