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