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