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)(27,34)(28,38)(29,33)(30,32)(31,37)(35,40)(36,39)(1,2,4,5)(3,6,7,8)(25,27,29,37)(26,31,33,34)(28,36,30,35)(32,39,38,40)(1,3)(2,6)(4,7)(5,8)(9,11,14,20)(10,15,17,24)(12,19,13,22)(16,23,21,18)(27,35)(28,30)(31,39)(32,38)(34,40)(36,37)(3,7)(6,8)(9,12,14,13)(10,16,17,21)(11,19,20,22)(15,23,24,18)(25,28,29,30)(26,32,33,38)(27,36,37,35)(31,39,34,40)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.