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