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