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