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