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