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