One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10)(11,15)(12,14)(13,16)(17,18,23,27)(19,24,28,25)(20,29,30,32)(21,31,22,26)(2,5)(6,7)(9,11)(10,13)(12,16)(14,15)(17,19)(18,24)(20,21)(22,30)(23,28)(25,27)(26,32)(29,31) involution — undirected(9,10)(11,15,16,13)(12,14)(17,20,22,19,23,30,21,28)(18,25,31,32,27,24,26,29)(1,3,4,8)(2,6,5,7)(10,14)(13,15)A 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.