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