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