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