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