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