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