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