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