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