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