One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(5,6,9,12)(7,8,11,10)(13,14)(15,21)(16,19)(17,20)(18,23)(22,26)(24,28)(25,27)(5,7,9,11)(6,10,12,8)(13,15,16,23)(14,18,19,21)(17,22,25,24)(20,28,27,26)(2,4)(5,8,9,10)(6,11,12,7)(14,19)(15,22)(17,25)(18,26)(21,28)(23,24)(2,4)(6,12)(7,11)(15,23)(18,21)(22,24)(26,28) involution — undirected(15,23)(18,21)(22,24)(26,28) 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.