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