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