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