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