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