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