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