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