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