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