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