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