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