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