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