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