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