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)(17,22)(18,27)(19,23)(20,24)(26,28) involution — undirected(1,2)(3,4)(6,9)(7,11) involution — undirected(5,6)(7,10)(8,9)(11,12)(13,15,19,16)(14,20,23,28)(17,24,18,26)(21,22,25,27)(2,4)(6,9)(10,12)(13,16,19,15)(14,21,23,25)(17,24,18,26)(20,22,28,27)(5,7,8,11)(6,10,9,12)(13,17,19,18)(14,22,23,27)(15,24,16,26)(20,25,28,21)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.