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