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