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