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