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