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