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