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