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