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