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)(12,26)(13,21)(14,19)(15,20)(16,24)(17,30)(18,32)(23,35)(25,40)(27,34)(28,38)(29,36)(31,39)(33,37) involution — undirected(1,3)(2,5)(4,8)(6,7)(9,11,15,24)(10,16,20,22)(12,27,29,31)(13,23,32,25)(14,28,33,30)(17,37,38,19)(18,35,21,40)(26,39,36,34)(9,12)(10,17)(11,14)(13,28)(15,29)(16,34)(18,36)(19,35)(20,38)(21,26)(22,39)(23,27)(24,33)(25,31)(30,32)(37,40) involution — undirected(2,6)(5,7)(9,13,15,32)(10,18,20,21)(11,23,24,25)(12,28,29,30)(14,27,33,31)(16,35,22,40)(17,36,38,26)(19,39,37,34)(3,8)(5,7)(9,14)(10,19)(11,12)(13,31)(15,33)(16,36)(17,35)(18,34)(20,37)(21,39)(22,26)(23,30)(24,29)(25,28)(27,32)(38,40) 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.