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