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