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