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)(15,17,21,18)(16,23,26,25)(20,28,24,27)(2,4)(6,9)(10,12)(13,15)(14,17)(16,24)(18,22)(19,21)(20,26)(23,27)(25,28) involution — undirected(5,7,8,11)(6,10,9,12)(13,16,17,27,19,26,18,28)(14,20,15,23,22,24,21,25)(1,2,3,4)(13,15,17,22,19,21,18,14)(16,25,27,20,26,23,28,24)(6,9)(10,12)(16,26)(20,24)(23,25)(27,28) 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.