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