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