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