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