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