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