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