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