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