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