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