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