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