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