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