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)(15,19)(16,17)(18,20)(14,17)(18,19) involution — undirected(5,6)(7,10)(8,9)(11,12)(13,14)(15,18)(16,17)(19,20) involution — undirected(5,7,8,11)(6,10,9,12)(13,15)(14,18)(16,20)(17,19)(1,3,4,2)(5,7)(6,10)(8,11)(9,12)(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.