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