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