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