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