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)(17,25)(20,23)(24,28)(26,27)(5,7)(6,9)(8,12)(10,11)(13,14)(15,20)(16,25)(17,21)(18,19)(22,27)(23,28)(24,26) involution — undirected(6,10)(9,11)(13,15,17,22,18,24,25,28)(14,20,21,27,19,26,16,23)(7,12)(9,11)(13,16)(14,17)(15,23)(18,21)(19,25)(20,22)(24,27)(26,28) involution — undirected(1,3,4,2)(6,10)(9,11)(13,17,18,25)(14,16,19,21)(15,22,24,28)(20,23,26,27)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.