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