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