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