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)(15,23)(16,17)(20,22)(21,25)(24,26) involution — undirected(1,2)(3,4)(6,9)(10,12)(14,20)(15,24)(16,17)(19,22)(21,25)(23,26) involution — undirected(5,7,8,11)(6,10,9,12)(13,14,17,20,18,22,16,19)(15,25,24,27,26,21,23,28)(2,4)(13,15,16,23,18,26,17,24)(14,21,19,27,22,25,20,28)(6,9)(10,12)(14,22)(19,20)(21,25)(27,28) involution — undirectedA 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.