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