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