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