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