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)(11,15)(12,16)(13,17)(14,18)(19,23)(20,22)(21,24)(26,31)(28,30)(34,40)(35,38) involution — undirected(2,5)(6,8)(9,11)(10,15)(12,20)(13,19)(14,21)(16,22)(17,23)(18,24)(25,26,29,31)(27,34,36,40)(28,33,30,37)(32,38,39,35)(1,3,4,7)(2,6,5,8)(10,16)(11,19)(12,13)(17,18)(20,21)(22,23)(25,27,29,36)(26,32,31,39)(28,35,30,38)(33,40,37,34)(2,5)(6,8)(9,12,14,13)(10,16,18,17)(11,20,21,19)(15,22,24,23)(25,28,29,30)(26,33,31,37)(27,35,36,38)(32,40,39,34)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.