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