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