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)(27,33)(28,36)(29,32)(30,35)(31,37)(34,38)(39,40)(3,7)(6,8)(9,11)(10,15)(12,13)(14,19)(16,23)(17,18)(20,21)(22,24)(25,26,29,32)(27,30,35,33)(28,31,37,36)(34,38,40,39)(1,2)(3,6)(4,5)(7,8)(10,16)(11,19)(13,21)(17,22)(25,26,29,32)(27,30,35,33)(28,36,37,31)(34,39,40,38)(9,12)(10,17)(11,13)(14,20)(15,18)(16,22)(19,21)(23,24)(25,27)(26,30)(28,34)(29,35)(31,38)(32,33)(36,39)(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)(25,26)(27,33)(28,31)(29,32)(30,35)(34,39)(36,37)(38,40) 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)(26,31)(27,34)(29,37)(30,38)(32,36)(33,39)(35,40) 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.