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