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