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