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