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