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