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