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