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