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