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