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