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