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