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