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