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