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