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