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