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