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