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