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