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