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