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