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