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