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