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