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)(16,17,26,28)(21,27,25,22)(2,4)(6,9)(10,12)(13,15)(14,20)(16,26)(18,19)(21,25)(23,24) involution — undirected(5,7,8,11)(6,10,9,12)(13,16,19,27,18,26,15,22)(14,21,24,28,23,25,20,17)(1,2,3,4)(13,17,19,21,18,28,15,25)(14,22,24,16,23,27,20,26)(6,9)(10,12)(14,23)(16,26)(20,24)(22,27) 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.