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