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