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