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