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