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