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