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