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