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