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