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