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