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