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