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