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