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