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