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