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