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