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