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