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