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