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