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