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