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