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)(15,25)(16,27)(17,22)(18,23)(19,24)(20,21)(26,28)(1,2)(3,4)(6,9)(10,11)(13,14)(15,16)(17,22)(18,23)(19,24)(20,26)(21,28)(25,27) involution — undirected(13,15,18,26,19,27,17,21)(14,20,22,16,24,28,23,25)(2,4)(13,16,17,20,19,25,18,28)(14,21,23,27,24,26,22,15)(5,7,8,12)(6,10,9,11)(13,17,19,18)(14,22,24,23)(15,21,27,26)(16,28,25,20)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.