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