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