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