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