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