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