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