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