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