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