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)(13,14,18,21)(15,16,20,25)(17,19,26,22)(23,27,28,24)(5,6)(7,11)(8,10)(9,12)(14,19)(15,20)(16,24)(17,26)(21,22)(25,27) involution — undirected(2,4)(5,7,8,12)(6,9,10,11)(13,15,18,20)(14,16,21,25)(17,23,26,28)(19,27,22,24)(7,12)(9,11)(13,16,18,25)(14,20,21,15)(17,27,26,24)(19,28,22,23)(6,10)(9,11)(14,21)(15,20)(19,22)(23,28) 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.