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