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