One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6,9,11)(7,12,8,10)(13,14)(15,18)(16,20)(17,21)(19,24)(22,25)(23,27)(26,28)(5,6)(7,10)(8,12)(9,11)(15,22)(16,23)(18,25)(19,26)(20,27)(24,28) involution — undirected(1,2,3,4)(13,15,16,22,17,24,23,28)(14,18,20,25,21,19,27,26)(5,7,9,8)(6,10,11,12)(5,8,9,7)(6,10,11,12)(13,15,23,28,17,24,16,22)(14,19,27,25,21,18,20,26)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.