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)(13,14,18,19)(15,22,23,28)(16,20,26,25)(17,24,27,21)(5,7)(6,9)(8,11)(10,12)(13,15,17,25,18,23,27,20)(14,16,21,22,19,26,24,28)(1,2,3,4)(7,11)(9,12)(14,19)(15,23)(20,25)(21,24)(7,11)(9,12)(13,16,18,26)(14,20,19,25)(15,24,23,21)(17,22,27,28)(6,10)(9,12)(14,19)(16,26)(21,24)(22,28) 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.