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