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