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