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