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