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