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