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