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