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