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