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