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