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