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