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