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