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