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