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