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