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)(25,26,29,32)(27,33,35,31)(28,30,38,39)(34,36,37,40)(2,5)(6,8)(9,11,12,15)(10,13,14,16)(18,21)(22,23)(25,27)(26,31)(28,37)(29,35)(30,36)(32,33)(34,38)(39,40)(1,3)(2,6)(4,7)(5,8)(11,15)(13,16)(19,24)(22,23)(25,28,30,32,29,38,39,26)(27,34,36,31,35,37,40,33)(3,7)(6,8)(17,19,20,24)(18,22,21,23)(26,32)(27,35)(28,38)(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.