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)(13,14,19,16,18,22,17,21)(15,23,24,20,26,27,25,28)(5,6)(7,11)(8,10)(9,12)(13,15,18,26)(14,20,22,28)(16,23,21,27)(17,24,19,25)(2,4)(5,7)(6,9)(8,12)(10,11) involution — undirected(7,12)(9,11)(13,16,19,22,18,21,17,14)(15,20,24,27,26,28,25,23)(6,10)(9,11)(13,17,18,19)(14,21,22,16)(15,24,26,25)(20,27,28,23)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.