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)(15,17)(16,19)(18,20)(22,25)(26,28)(6,9)(10,12)(14,15)(16,20)(23,27)(26,28) involution — undirected(5,6)(7,10)(8,9)(11,12)(13,14,17,15)(16,18,20,19)(21,22)(23,26)(24,25)(27,28)(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,15,17,14)(16,18,20,19)(21,23,24,27)(22,26,25,28)(5,7)(6,10)(8,11)(9,12)(13,16)(14,18)(15,19)(17,20)(21,22)(23,26)(24,25)(27,28) 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.