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