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