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