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