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