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