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