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