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