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