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