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