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