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)(11,13)(12,14)(15,16)(17,18,23,28)(19,24,31,38)(20,25,30,37)(21,26,35,42)(22,27,33,40)(29,36,45,48)(32,39,44,47)(34,41,43,46)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19,23,31)(18,24,28,38)(20,22,30,33)(21,32,35,44)(25,27,37,40)(26,39,42,47)(29,43,45,34)(36,46,48,41)(10,14)(11,15)(17,20,23,30)(18,25,28,37)(19,22,31,33)(21,32,35,44)(24,27,38,40)(26,39,42,47)(29,34,45,43)(36,41,48,46)(1,3,4,7)(2,6,5,8)(10,14)(13,16)(17,21,33,43,23,35,22,34)(18,26,40,46,28,42,27,41)(19,29,30,44,31,45,20,32)(24,36,37,47,38,48,25,39)(2,5)(6,8)(17,22,23,33)(18,27,28,40)(19,30,31,20)(21,34,35,43)(24,37,38,25)(26,41,42,46)(29,44,45,32)(36,47,48,39)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.