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