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