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