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