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