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