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