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