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