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