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