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