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