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