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