One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,10)(8,9)(11,12)(13,14,19,16)(15,23,26,28)(17,21,18,22)(20,25,27,24)(1,2,3,4)(13,15,17,24,19,26,18,25)(14,20,22,23,16,27,21,28)(6,9)(10,12)(15,24)(17,18)(20,23)(21,22)(25,26)(27,28) involution — undirected(13,16,19,14)(15,23,26,28)(17,22,18,21)(20,25,27,24)(5,7,8,11)(6,10,9,12)(13,17,19,18)(14,21,16,22)(15,24,26,25)(20,28,27,23)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.