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