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