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