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