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