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