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