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