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