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