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