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