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