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