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