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