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