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