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