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)(13,14,18,23,17,22,26,20)(15,21,24,28,16,19,25,27)(2,3)(5,6)(7,11)(8,10)(9,12)(13,15,17,16)(14,19,22,21)(18,24,26,25)(20,28,23,27)(5,7)(6,9)(8,12)(10,11)(14,20)(15,16)(18,26)(19,27)(21,28)(22,23) involution — undirected(1,3,4,2)(7,12)(9,11)(13,16,17,15)(14,21,22,19)(18,25,26,24)(20,27,23,28)(6,10)(9,11)(14,22)(15,16)(20,23)(24,25) 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.