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