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