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