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