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