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