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