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