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