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