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