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