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