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