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