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