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