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