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