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