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