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