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