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