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