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