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