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