One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(13,14)(15,19)(16,17)(18,20) involution — undirected(1,2,3,4)(5,6)(7,11)(8,9)(10,12)(6,9)(10,11)(14,17)(18,19) involution — undirected(5,7)(6,10)(8,12)(9,11)(13,14)(15,18)(16,17)(19,20) involution — undirected(5,7)(6,10)(8,12)(9,11)(13,15,16,20)(14,18,17,19)(5,6)(7,10)(8,9)(11,12) 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.