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