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