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