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