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