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