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