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