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