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