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