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