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