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