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