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