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