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