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)(13,14,20,28,19,17,18,23)(15,24,26,21,16,22,25,27)(5,6)(7,11)(8,10)(9,12)(13,15)(14,21)(16,19)(17,27)(18,26)(20,25)(22,23)(24,28) involution — undirected(1,2,3,4)(5,7)(6,9)(8,12)(10,11)(13,16,19,15)(14,22,17,24)(18,26,20,25)(21,28,27,23)(7,12)(9,11)(13,17,20,23,19,14,18,28)(15,24,26,21,16,22,25,27)(6,10)(9,11)(15,16)(21,27)(22,24)(25,26) 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.