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