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