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