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