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)(19,28,30,41)(20,33,36,42)(21,25,37,26)(23,31,39,32)(24,34,40,35)(29,38,44,47)(43,46,48,45)(1,3,5,4)(2,6,8,7)(9,10)(11,14)(12,13)(15,16)(17,19,22,30)(18,23,27,39)(20,29,36,44)(21,31,37,32)(24,38,40,47)(25,28,26,41)(33,43,42,48)(34,45,35,46)(1,3,5,4)(2,7,8,6)(10,13)(14,16)(17,20,22,36)(18,24,27,40)(19,29,30,44)(21,34,37,35)(23,38,39,47)(25,33,26,42)(28,43,41,48)(31,45,32,46)(1,4,5,3)(2,6,8,7)(9,11)(10,14)(12,15)(13,16)(19,30)(23,39)(28,41)(29,44)(31,32)(38,47)(43,48)(45,46)(11,15)(14,16)(17,21,22,37)(18,25,27,26)(19,31,30,32)(20,34,36,35)(23,28,39,41)(24,33,40,42)(29,45,44,46)(38,43,47,48)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.