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