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