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