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