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