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