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