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