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