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