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