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