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