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