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