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