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