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