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