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