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)(15,18,19,16)(22,27)(24,28)(2,4)(6,9)(7,12)(13,15,17,19)(14,16,20,18)(21,22,26,27)(23,28,25,24)(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,15)(14,16)(17,19)(18,20)(21,23,26,25)(22,28,27,24)(5,6)(7,11)(8,9)(10,12)(13,15)(14,18)(16,20)(17,19)(21,24)(22,23)(25,27)(26,28) involution — undirected(5,7,8,12)(6,10,9,11)(13,16,17,18)(14,19,20,15)(21,25,26,23)(22,28,27,24)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.