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