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