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)(13,14)(15,20)(16,21)(17,19)(18,22)(23,28)(24,27)(25,26) involution — undirected(5,7)(6,9)(8,11)(10,12)(14,19)(15,23)(16,17)(20,27)(21,22)(26,28) involution — undirected(2,4)(7,11)(9,12)(13,15)(14,20)(16,24)(17,25)(18,23)(19,26)(21,27)(22,28) involution — undirected(7,11)(9,12)(13,16,18,17)(14,21,22,19)(15,24,23,25)(20,27,28,26)(6,10)(9,12)(14,22)(15,23)(19,21)(24,25) 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.