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