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