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