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