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