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