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