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