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)(15,19)(16,20)(17,21)(18,24)(22,27)(23,26)(25,28)(5,6)(7,10)(8,12)(9,11)(15,22)(17,23)(18,25)(19,27)(21,26)(24,28) involution — undirected(1,2,3,4)(13,15,23,28,16,24,17,22)(14,18,26,27,20,19,21,25)(5,7,9,8)(6,10,11,12)(5,8,9,7)(6,10,11,12)(13,15,17,22,16,24,23,28)(14,19,21,27,20,18,26,25)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.