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