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