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