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