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