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