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