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)(11,17)(12,16)(13,15)(14,19)(18,24)(20,22)(21,23)(25,26)(27,34)(28,38)(29,32)(30,33)(31,36)(35,37)(39,40) involution — undirected(9,11,13,19)(10,14,15,17)(12,20,21,18)(16,24,23,22)(25,27,29,36)(26,31,32,34)(28,37,30,39)(33,35,38,40)(2,5)(6,8)(25,26)(27,35)(28,33)(29,32)(30,38)(31,39)(34,37)(36,40) involution — undirected(1,3,4,7)(2,6,5,8)(10,15)(14,17)(16,23)(22,24)(26,32)(31,34)(33,38)(35,40)(9,12,13,21)(10,16,15,23)(11,18,19,20)(14,22,17,24)(25,28)(26,33)(27,36)(29,30)(32,38)(35,40)A 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.