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