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