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