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