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