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