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