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