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