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