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