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