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)(11,14,18,22)(12,15,20,23)(17,24,19,21)(25,26,29,32)(27,34,35,31)(28,36,37,40)(30,39,38,33)(2,5)(6,7)(9,11)(10,14)(12,19)(13,18)(15,21)(16,22)(17,20)(23,24)(25,27,29,35)(26,31,32,34)(28,30,37,38)(33,40,39,36)(9,12)(10,15)(11,17,18,19)(13,20)(14,21,22,24)(16,23)(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)(15,23)(17,19)(21,24)(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.