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