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)(17,18,22,26,21,24,20,27)(19,25,28,23,30,32,29,31)(2,5)(6,7)(9,11)(10,13)(12,15)(14,16)(17,19)(18,23)(20,28)(21,30)(22,29)(24,31)(25,26)(27,32) involution — undirected(1,3,4,8)(2,6,5,7)(10,14)(11,15)(18,24)(23,31)(25,32)(26,27)(11,15)(13,16)(17,19)(18,25)(20,29)(21,30)(22,28)(23,26)(24,32)(27,31) involution — undirected(17,20,21,22)(18,26,24,27)(19,28,30,29)(23,25,31,32)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.