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