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