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