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