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