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