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