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