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