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