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