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