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