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