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