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)(15,23)(17,20)(21,25)(22,28)(24,27)(6,9)(7,11)(13,14,20,28,18,22,17,19)(15,24,26,27,23,21,16,25)(2,4)(5,6)(7,10)(8,9)(11,12)(13,15)(14,21)(16,17)(18,23)(19,27)(20,26)(22,24)(25,28) involution — undirected(6,9)(10,12)(13,16,18,26)(14,21,22,24)(15,20,23,17)(19,25,28,27)(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.