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