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