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