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