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)(15,23,26,25)(19,27,28,24)(6,9)(10,12)(13,14,17,22,18,20,16,21)(15,24,25,28,26,27,23,19)(2,4)(5,7)(6,10)(8,11)(9,12)(13,15)(14,19)(16,25)(17,23)(18,26)(20,28)(21,24)(22,27) involution — undirected(7,11)(10,12)(14,20)(19,28)(21,22)(24,27) involution — undirectedA 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.