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