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