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