One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,7,4,6)(9,10)(11,13)(12,14)(15,16)(17,18)(19,28)(20,25)(21,26)(22,23)(24,31)(27,29)(30,42)(32,39)(33,40)(34,37)(35,41)(36,43)(38,46)(44,47)(45,48)(1,3,5,4)(2,6,8,7)(9,11)(10,13)(12,15)(14,16)(18,23)(24,36)(25,37)(26,27)(28,39)(38,47)(40,41)(42,48)(1,3,5,4)(2,7,8,6)(10,14)(11,15)(17,19,29,43,22,32,21,31)(18,24,26,39,23,36,27,28)(20,30,33,44,34,45,35,46)(25,38,41,48,37,47,40,42)(1,4,5,3)(2,6,8,7)(11,15)(13,16)(17,20,22,34)(18,25,23,37)(19,30,32,45)(21,35,29,33)(24,38,36,47)(26,41,27,40)(28,42,39,48)(31,46,43,44)(17,21,22,29)(18,26,23,27)(19,31,32,43)(20,33,34,35)(24,39,36,28)(25,40,37,41)(30,44,45,46)(38,42,47,48)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.