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