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)(15,19,25,26)(16,24,27,21)(18,22,28,23)(5,7,9,8)(6,10,11,12)(13,15)(14,19)(16,22)(17,25)(18,21)(20,26)(23,27)(24,28)(1,2,3,4)(14,20)(15,21)(16,26)(18,28)(19,27)(24,25)(5,8,9,7)(6,10,11,12)(13,16)(14,21)(15,23)(17,27)(18,26)(19,28)(20,24)(22,25)(15,24)(16,26)(18,28)(19,27)(21,25)(22,23) 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.