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