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