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