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