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