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