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