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