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