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