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