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