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