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