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