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