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)(13,14,17,18)(15,21,22,19)(16,24,25,20)(23,26,28,27)(2,3)(6,10)(11,12)(14,18)(15,22)(16,20)(23,27)(24,25)(26,28) involution — undirected(1,2,4,3)(5,7,9,8)(6,11,10,12)(13,15,17,22)(14,19,18,21)(16,23,25,28)(20,26,24,27)(1,3,4,2)(5,8,9,7)(6,12,10,11)(13,16)(14,20)(15,23)(17,25)(18,24)(19,26)(21,27)(22,28)(6,10)(11,12)(15,22)(16,25)(19,21)(20,24) 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.