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)(17,19,21,32,23,33,22,31)(18,24,27,40,28,41,26,29)(20,35,36,46,38,30,37,47)(25,42,34,45,44,39,43,48)(10,13)(14,16)(17,20,22,37,23,38,21,36)(18,25,26,43,28,44,27,34)(19,30,31,46,33,35,32,47)(24,39,29,45,41,42,40,48)(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.