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