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