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)(21,22)(23,28)(24,25)(26,27)(1,2,3,4)(5,6)(7,10)(8,9)(11,12)(13,15)(14,18)(16,20)(17,19)(22,27)(23,24)(1,2)(3,4)(6,9)(10,11)(15,19)(16,18)(21,23,26,24)(22,28,27,25)(5,7)(6,10)(8,12)(9,11)(13,14)(15,16)(17,20)(18,19)(21,24,26,23)(22,25,27,28)(5,6)(7,11)(8,9)(10,12)(13,16)(14,19)(15,20)(17,18)(21,25)(22,24)(23,27)(26,28) 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.