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