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