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