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