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