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