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