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