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