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)(15,18)(16,24)(17,22)(19,20)(21,26)(23,28)(25,27)(1,2)(3,4)(6,10)(11,12)(13,15,18,14)(16,25,27,24)(17,20,19,22)(21,26,23,28)(14,20)(15,22)(17,19)(21,24)(23,25)(26,28) involution — undirected(2,4)(5,7,9,8)(6,11,10,12)(13,16)(14,21)(15,23)(17,26)(18,27)(19,28)(20,24)(22,25)(5,8,9,7)(6,11,10,12)(13,17,18,19)(14,20,15,22)(16,26,27,28)(21,24,23,25)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.