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