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