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