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