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