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