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