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