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