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