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