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)(15,18)(16,20)(17,21)(19,22)(23,25)(24,27)(26,28)(1,2,3,4)(13,15,18,14,19,21,17,22)(16,24,26,28,27,20,25,23)(6,9)(10,12)(13,16)(14,20)(15,23)(17,26)(18,25)(19,27)(21,28)(22,24) involution — undirected(2,4)(5,7,8,11)(6,10,9,12)(14,21)(15,22)(17,18)(20,28)(23,24)(25,26)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.