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