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