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