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