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