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