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