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