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