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