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