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