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