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