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