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