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