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