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