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