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