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