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