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