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