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