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