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