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