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