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