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