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