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