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