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