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