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