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