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