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