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