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