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