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