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