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