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