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