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