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