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