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