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