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