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