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