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