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