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