One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(17,18,22,27,23,28,21,26)(19,24,30,38,32,40,31,39)(20,33,34,41,35,42,36,25)(29,43,45,48,46,47,44,37)(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,19,23,32)(18,24,28,40)(20,29,35,46)(21,31,22,30)(25,37,41,48)(26,39,27,38)(33,43,42,47)(34,45,36,44)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(17,20,23,35)(18,25,28,41)(19,29,32,46)(21,34,22,36)(24,37,40,48)(26,33,27,42)(30,44,31,45)(38,47,39,43)(9,11)(10,14)(12,15)(13,16)(17,21,23,22)(18,26,28,27)(19,30,32,31)(20,34,35,36)(24,38,40,39)(25,33,41,42)(29,44,46,45)(37,47,48,43)(11,15)(14,16)(17,21,23,22)(18,26,28,27)(19,31,32,30)(20,34,35,36)(24,39,40,38)(25,33,41,42)(29,45,46,44)(37,43,48,47)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.