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