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