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